Heath



A. E. HEATH.

SPARKING PLUG FOR IGNITION PURPOSES.

APPLICATION FILED SEPT. 29, 1919.

Patented June 8, 1920.

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UNITED STATES ARTHUR, ERNES'TEEAH, OF LONDON, ENGLAND.

SPAR/KING PLUG 1F03-.t IGNITION PURPOSES,

Spccilcation of Letters Patent.

Patented June 8, 1920.

Application filed. September 29, 1919. Serial No. 327,015.

To all wlw/nt if; may concern.'

De it known that l, An'rirun Enivns'r llnafrrr., a subject oi the Kingof Great Britain, residing at London, England7 have invented certain newand useiul Improve ments in Sparking Plugs for Ignition Pun poses7 ofwhich the following is a specilication.

The object of this invention is to give further protection to theinsulator together' with the central electrode, from the hot gases andoil vapor, than is possible with known sparking plugs having bailles oivarious terms, and to prevent as far as possible the insulator beingoverheated and breaking down electrically, the carbonizing of itssurface and preignition.

For the purpose et my invention l position a sleeve ot metal or other'suitable material in combination with a holed baille such sleeve beingpositioned between the insulator carrying the central electrode and theinner wall of the sparking plug body at that part exposed to the hotgases such sleeve being held in position by any desired means such as byforming the sleeve with a ilange and gripping the flange on a shoulderformed on the plug body by the nut retaining the insulator. On each sideot the sleeve is a space and below the sleeve is positioned the balilethrough which l drill a ring of holes, such holes being so positionedthat the bulk of the hot gases and oil vapor are directed into the spacebetween the sleeve and the plug body and the sleeve may be contracted atthe lower part to assist in directing the gases and oil vapor into thespace between the sleeve and the plug body, a small portion of gases andoil vapors also passing through the hole in the center of the baillemixing with the cooler gases that have passed through the ring of holesin the battle and toward and into the space between the sleeve and theinsulator.

The tubular sleeve may be held in the plug` body in several ways and bemade in several forms, for instanceV it may be held at its top by aflange or collar and around its circumference and near its lower end bya flange or collar having slots for the passage ot gas and oil vaporinto the outer space. A

My invention will be clearly understood from the 'following descriptionaided by the example shown on the annexed drawings.

Figure' l a part sectional elevation of a sparking plug embodying myinvention.

Fig, Q is an under plan of Fig. l.

Fig. 3 is a plan of the sleeve.

Fig. 4 is an elevation of the sleeve.

Fig. 5 is an under plan of the sleeve.

I provide the plug body A with a shoulder B and with a battle C havingholes D. lVithin the plug body A, l position a sleeve E such sleevehaving a llange F engaging the shoulder B and its body portion some whatconical or to conform somewhat to the shape of the insulator Gr at thepart which it surrounds, the sleeve further hav ing a collar or flange Hon its outer surface and near its lower end such collar being providedwith slots or openings I to allow free access ot the gases and oilvapors to the space between the sleeve and the wall of the plug A thecollar or flange making inetallic contact with the plug body A so as toassist in holding the sleeve E in place and conveying the heat of thegases imparted to the sleeve as much as possible to the plug body. Thesleeve E is contracted at the lower part as at J to assist in conductingthe gases entering by the holes D into the space between the sleeve Eand the plug body A the holes D being also positioned for that purpose.

The end of the central electrode K is situate within the central hole ofthe baille as is usual and the sleeve E is so constructed that there isa space on each side of it, that is to say, there is a space between thesleeve and the wall of the plug as also a space between the sleeve andthat part of the insulator exposed to the hot gases.

By this construction the main portion of the hot gases will pass throughthe holes D into the space between the sleeve and the plug body and thusthe bulk ot the heat will be imparted to the sleeve and plug body andnot direct to the insulator Gr, there only being a small proportion ofthe hot gases passing through the hole surrounding the electrode thesegases mixing with the gases that have been cooled by passing through theholes in the baille and as a great proportion ot the heat ot these willbe imparted to the holed baffle C and the sleeve E the sleeve E havingContact with the plug body by its Hanges and collar F and H the heatWill be conveyed' to the plug body and thereby the insulator Gr andeleetrodeK'are'kept as cool as possible.

The sleeve E is further held in position by the shoulder portion L ofthe insulator pressing upon its liange F Whenthe gland nut M is screwedhome or the lange F may be dispensed with, a Washer N being interposedbet'ween the shouldered portion L and the flange F or edge ofthe sleeveE and the shoulder O, thus making a gas tight oint.

lhat I' do claim vras Iny inventionund desire' to secure byLettersPatent s tl. In sparking plugs for :ignition purposes having abailleprovided with ring of holes, Laitubular sleeveL positioned andheld Within the plug bodyandsurrounding the insulator carrying thecentral electrode at that'part 'exposed to the'hot-gases, a space beingprovided on eaoh'side of thesleeve, substantially las 'and lfor thepurposes set forth.

2. In sparking plugs for ignition purposes having a baille provided witha ring or' holes, and a tubular sleeve as set forth in claim lpositioning the holes in the baille so as to direct the hot gasespassing through same into the space between the sleeve and the plugbody.

3. In a sparking plug for ignition purposes having a ballie providedwith a ring oi' holes, a tubular sleeve within the plug body andsurrounding the insulator ol the Central electrode at the part exposedto the hotgases and having spaces on each side, such sleeve beingprovided with flanges lor engagement and Contact with theplug body forConducting the heat imparted to it by the hot gases away from theinsulator and to the plug bo'dy, substantially as deserihcal.

Intestimony whereot'l havehereunto set iny hand in presence of twosubscribing wit ARTHUR ERNEST HEATH.

Witnesses `WM. O. BROWN, FRED. HU'roHnNs.

